High current vacuum circuit interrupter with beryllium contact

Details High current vacuum circuit interrupter with beryllium contact High current vacuum circuit interrupter with beryllium contact

1974-12-03

1977-06-07

Scott, James R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200270, H01H 3366, H01H 102

Patent

active

040285146

ABSTRACT:
A vacuum-type circuit interrupter rated to interrupt currents of 30,000 amperes r.m.s. and highercomprises a pair of separable contacts having arcing portions between which arcs are formed upon disengagement of said contacts. These arcing portions are of a material consisting essentially of beryllium formed from a vacuum-cast ingot that has been subjected to hot working by extrusion to produce a microstructure characterized by grains much smaller on the average than the grains of the as-cast ingot.

REFERENCES:
patent: 2949520 (1960-08-01), Schneider
patent: 3140373 (1964-07-01), Horn
patent: 3234351 (1966-02-01), Hebb
patent: 3246979 (1966-04-01), Lafferty et al.
patent: 3327081 (1967-06-01), Pflanz
patent: 3497755 (1970-02-01), Horn
patent: 3522399 (1970-07-01), Crouch
patent: 3546407 (1970-12-01), Schneider
patent: 3624325 (1971-11-01), Horn et al.
patent: 3821505 (1974-06-01), Wood
patent: 3825789 (1974-07-01), Harris
G. E. Meyer et al., "Beryllium Ingot Sheet and Other Wrought Forms", Metallurgical Society Conferences, vol. 33, Beryllium Technology, vol. 1, pp. 589-612, Science Publishers, Inc., 1966.
The Beryllium Corporation, "New Beryllium Sheet Offer Greater Ductility, Ease of Fabrication", Publicity Department Release, BRL 6418, pp. 1-8(all), Feb. 1965.
John P. Denny et al., "Casting Beryllium Ingots and Shapes", Metallurgical Society Conferences, vol. 33, Beryllium Technology, vol. 2, pp. 807-824, Science Publishers, Inc., 1966.

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